Scott tries to rescue Lydia from Eichen house.
Deaton finds new information about the Dread Doctors while Scott and Malia come up with a plan to help their friends.
Scott and his friends follow Dr. Valack's advice; and experience strange effects as a result.
The pack enters Eichen House in order to learn more about the Dread Doctors.
Stiles tracks a fugitive; and Liam plays wingman for Mason at a nightclub.
Scott tracks a new shapeshifter that's threatening Stilinski; and Malia receives information about her mother.
Scott and Stiles look to help out Kate against the pack.
Satomi's pack looks for protection from Scott and others. Malia and Stiles find out more secrets about the dead pool list.
Scott carries out a dangerous plan. Meanwhile, Malia confronts her past.
The school is under quarantine when a deadly virus hits it; Meanwhile, Braeden is shot.
The gang hits a breakthrough when Violet is arrested but Garrett manipulates Scott into helping him and getting her out.
Lydia is looking for assistance with her powers; Scott, Stiles and Kira engage in their first lacrosse game together.
Scott's position on the lacrosse team is threatened. Meanwhile, Stilinski investigates a murder.